Regulation of Alfvén Eigenmodes by Microturbulence in Fusion Plasmas

Liu, P.; Wei, X.; Lin, Z.; Brochard, G.; Choi, G. J.; Heidbrink, W. W.; Nicolau, J. H.; McKee, G. R.

doi:10.1103/physrevlett.128.185001

Regulation of Alfvén Eigenmodes by Microturbulence in Fusion Plasmas

Journal Article · Wed May 04 00:00:00 EDT 2022 · Physical Review Letters

DOI:https://doi.org/10.1103/physrevlett.128.185001· OSTI ID:1971356

^[1]; ^[2]; ^[2]; ^[2]; Choi, G. J. ^[2]; Heidbrink, W. W. ^[2]; ^[2]; McKee, G. R. ^[3]

Univ. of California, Irvine, CA (United States); General Atomics
Univ. of California, Irvine, CA (United States)
Univ. of Wisconsin, Madison, WI (United States)

Global gyrokinetic simulations of mesoscale reversed shear Alfven eigenmodes (RSAE) excited by energetic particles (EP) in fusion plasmas find that RSAE amplitude and EP transport are much higher than experimental levels at nonlinear saturation, but quickly diminish to very low levels after the saturation when background microturbulence is artificially suppressed. In contrast, in simulations coupling micro-meso scales, the RSAE amplitude and EP transport decrease drastically at the initial saturation but later increases to the experimental levels in the quasi-steady state with bursty dynamics due to regulation by thermal ion temperature gradient (ITG) microturbulence. The quasi-steady state EP transport is larger for a stronger microturbulence. Here, the RSAE amplitude in the quasi-steady state ITG-RSAE turbulence from gyrokinetic simulations, for the first time, agrees very well with experimental measurements.

View Accepted Manuscript (DOE)

Research Organization:: General Atomics, San Diego, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES)

Grant/Contract Number:: AC02-05CH11231; AC05-00OR22725; FC02-04ER54698

OSTI ID:: 1971356

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 18 Vol. 128; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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